What is fltsrv?

The genuine fltsrv.sys file is a software component of Acronis Storage Filter Management by Acronis.
Filter management overcomes the issue of dealing with open Window files during disk imaging by effectively freezing a specific moment in time. The filter driver layers allow the software to create and backup consistent views of files, including open files. When imaging of the hard disk drive is initiated the filter driver flushes the file system mounted to that volume. All the operations on the system volume are temporarily frozen while the filter driver creates a point-in-time view of the system volume and a bitmap. Once the bitmap is created, the filter driver unfreezes the I/O operations on the system volume. This typically takes only seconds. The operating system continues working as usual and the software can start imaging of the system volume. Acronis is a global supplier of data protection solutions and develops software for backup, disaster recovery, and secure file sharing and data access. The company was founded in 2003.

FltSrv stands for Acronis Storage Filter Management Service

Fltsrv.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if fltsrv.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for fltsrv drivers in need of updating

Fltsrv.sys file information

The process known as Acronis Storage Filter Management Driver or fltsrv belongs to software Acronis Storage Filter Management or fltsrv by Acronis International GmbH or Acronis (

Description: Fltsrv.sys is not essential for the Windows OS and causes relatively few problems. The fltsrv.sys file is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 76,768 bytes (80% of all occurrences) or 123,744 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program has no visible window. The file is certified by a trustworthy company. There is no detailed description of this service. Fltsrv.sys is not a Windows system file. Fltsrv.sys is a trustworthy file from Microsoft. The fltsrv.sys file is a Verisign signed file. fltsrv.sys appears to be a compressed file. Therefore the technical security rating is 6% dangerous, however you should also read the user reviews.

Recommended: Identify fltsrv.sys related errors

Important: Some malware disguises itself as fltsrv.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the fltsrv.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Well it very well maybe an Acronis file however after disabling the Acronis services and then renaming this file to fltsrv.old and rebooting my Windows XP Laptop. It blue screens just like the cloned copy of my hard drive does. Not sure if it was disabling the services or renaming that file but those are the only changes I made.

Summary: Average user rating of fltsrv.sys: based on 2 votes with 1 user comment. 2 users think fltsrv.sys is essential for Windows or an installed application.

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Best practices for resolving fltsrv issues

A clean and tidy computer is the key requirement for avoiding problems with fltsrv. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the fltsrv.sys process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

fltsrv.sys [all]